Copywriter - Nonprofit

As Cro Metrics continues to scale its integrated growth marketing services, the creative team is expanding to meet rising demand across paid media, CRO experimentation, website design, and lifecycle marketing, particularly among nonprofit and mission-driven clients. This role is part of a strategic hiring plan to bring on reliable, high-quality creative talent that strengthens our ability to deliver hypothesis-driven, conversion-focused copy across every client touchpoint.

You'll write the words that go inside paid ads, landing pages, experiments, and email campaigns, with a primary focus on nonprofit and mission-driven organizations. This includes donor acquisition, fundraising campaigns, and impact-driven messaging, plus B2B and B2C client work as capacity allows. Every line you write has a hypothesis behind it and a test in front of it. You'll also build and manage brand-specific AI writing agents that scale our copy output while preserving voice integrity. You'll work closely with strategists, designers, and analysts to produce copy that moves metrics, not just reads well.

This is a long-term fractional contractor role. Most contractors stay on contract long-term, as the relationship is designed to be sustainable at part-time hours and can flex with client contract cycles. Conversion to full-time employment happens selectively when there's a clear business need and mutual interest. Either way, we're looking for someone we can build with long-term.

About Cro Metrics

At Cro Metrics, we're on a mission to redefine growth for organizations and brands through unparalleled digital experiences that inspire action and deliver results. We are an experiment-led growth marketing agency that partners with mission-driven and high-growth companies to scale through data-driven experimentation. Our expertise spans A/B testing, personalization, paid media, lifecycle marketing, and full-funnel digital strategy — empowering clients to make smarter decisions that drive measurable results.

Our fully remote team of strategists, analysts, engineers, and creatives works across industries including eCommerce, fintech, nonprofit, and hospitality. We believe in autonomy, collaboration, and innovation as we help our clients grow smarter and faster.

About the Role

The Copywriter - Nonprofit is responsible for producing high-quality copy across Cro Metrics' integrated service lines, with a primary focus on nonprofit and mission-driven clients. You'll write paid media ad copy, landing page copy, headline variants for A/B tests, product page rewrites, and email and SMS campaigns.

For nonprofit clients specifically, this means donation page copy, fundraising appeals, donor lifecycle emails and SMS, and campaign copy built around the fundraising calendar, all written with the storytelling, urgency, and trust-building that donor audiences respond to.

You'll work primarily with nonprofit and mission-driven organizations, plus B2B and B2C clients as capacity allows, adapting messaging to our client’s audiences that range from individual donors and institutional funders to enterprise buyers and direct consumers.

This role is ideal for a copywriter who thinks in hypotheses, writes for conversion, and can shift between brand voices quickly and confidently. You'll be writing the copy that goes live inside experiments and campaigns, where every word has a measurable impact.

The first 5–10 business days of the engagement are a paid evaluation period. You'll do real client work at your full contract rate. At the end, we'll either continue the engagement, extend the evaluation for a few more days if we need more signal, or end the engagement. In all three cases, we'll tell you why and pay for all hours worked.

What You'll Do

• Write donor-facing copy for nonprofit and mission-driven clients. This includes donation page copy, fundraising emails and SMS appeals, year-end and GivingTuesday campaigns, monthly/recurring giving asks, matching gift promotions, and impact-driven landing pages where the "product" is a mission.
• Write paid media ad copy across platforms ( Meta , Google , LinkedIn). This includes headlines, descriptions, and creative copy that drives clicks, donations, and conversions.
• Produce landing page copy from briefs and wireframes, collaborating with designers to ensure messaging and layout work together.
• Write conversion-focused copy for A/B tests. This could include headline variants, CTA copy, value proposition or ask-amount rewrites, and messaging hierarchy tests where each variant is mapped to a clear hypothesis.
• Write email and SMS copy for lifecycle and donor journey campaigns (welcome flows, abandoned cart or gift, win-back/lapsed donor, promotional and appeal sends) within client brand voice guidelines.
• Rewrite underperforming copy based on test results and analytics, diagnosing what's not working and proposing data-informed alternatives.
• Adapt quickly to new client brand voices, absorbing voice guides and existing copy to produce on-brand work from the first deliverable, including the balance of authenticity, trust, and urgency that nonprofit tone requires.
• Collaborate closely with growth strategists. Your copy is the execution layer of their experimentation roadmap.
• Manage your workload across multiple concurrent clients and projects, communicating proactively about capacity, timelines, and blockers.
• Use AI tools to accelerate drafting, variant generation, and research while maintaining the craft, originality, and strategic rigor that make great copy.
• Build, train, and manage brand-specific AI writing agents. You’ll be creating custom prompts, voice calibration files, and guardrails so AI output stays on-brand for each client. Maintain and iterate on these agents as client voices evolve.

What We're Looking For

• 2–4+ years of experience in conversion copywriting, direct-response writing, CRO copy, or performance marketing copy.
• Experience writing for nonprofit or mission-driven organizations, e.g. donation optimization, fundraising appeals, donor communications, and impact framing.
• A portfolio demonstrating copy that was written to be tested, such as paid ads, landing pages, headline variants, or email campaigns with clear strategic framing, ideally including nonprofit or fundraising work.
• Ability to write across multiple brand voices quickly and accurately. You can absorb a voice guide and produce on-brand copy on the first pass.
• Strong strategic instinct. You understand why copy converts, not just what sounds good.
• Comfort with volume and speed. You can produce multiple variants quickly without sacrificing quality or strategic thinking.
• Clear communication skills. You ask good questions about briefs, flag ambiguity early, and explain your copy rationale to non-writers.
• Self-directed and reliable. You manage your time well, meet deadlines consistently, and don't need to be micromanaged.
• AI is a hard requirement, not a preference. This role requires active, demonstrated use of AI tools in your daily workflow — and goes further. You'll be expected to build and manage brand-specific AI writing agents that the team can use at scale. You'll be asked to show concrete AI-integrated workflows and agent-building experience during the interview process. Candidates who cannot demonstrate practical AI tool use and agent creation will not advance.

Must Haves

• Experience at an agency or in a multi-client environment where you managed competing priorities and fast turnarounds.
• Experience writing copy for nonprofit or mission-driven organizations (examples could include donation pages, fundraising appeals, or donor communications.)
• Demonstrated experience building AI writing agents, such as custom GPTs , Claude projects, or similar tools configured with brand voice, tone rules, and output guardrails for specific clients.

What Success Looks Like

• You consistently deliver on-brand, hypothesis-driven copy on time and with minimal revision cycles.
• Strategists and designers trust your copy output and view you as a reliable creative partner.
• You manage a steady cadence of deliverables across multiple clients without quality or strategic rigor dipping.
• Every variant you write has a clear rationale, and you can explain why each one should win.
• You proactively flag brief gaps, ask clarifying questions early, and communicate about capacity honestly.
• Over time, you build reusable copy frameworks and swipe files that make the whole team faster.
• You build and maintain AI writing agents that the team actually uses. Those agents produce on-brand first drafts that save hours, and you keep them calibrated as client voices evolve.
• You move fluidly between nonprofit, B2B, and B2C clients without a quality drop.
• Your nonprofit clients see it in the numbers: stronger donation conversion, better donor email/SMS engagement, or lower cost-per-acquisition through copy that balances mission-driven storytelling with conversion discipline.